使用ScrolledComposite SWT时，为什么放在TabItem上的小部件不可见？

Here is my code which actually does all the GUI work for Domain(right side contained in the picture attached).In this function What i am doing is I am creating a composite "test" on the "newTabFolder".Then i am creating ScrolledComposite "sc" on it and then Creating a composite "compositeInTab" on it and after placing all the widgets on "compositeInTab" I am creating a TabItem for placing the composite "test" on it.Here is my code which actually does all the GUI